RCW 59.18.285

Nonrefundable fees not to be designated as deposit—Written rental agreement required—Remedies.

No moneys paid to the landlord which are nonrefundable may be designated as a deposit or as part of any deposit. If any moneys are paid to the landlord as a nonrefundable fee, the rental agreement shall be in writing and shall clearly specify that the fee is nonrefundable. If the landlord fails to provide a written rental agreement, the landlord is liable to the tenant for the amount of any fees collected as nonrefundable fees. If the written rental agreement fails to specify that the fee is nonrefundable, the fee must be treated as a refundable deposit under RCW 59.18.260, 59.18.270, and 59.18.280.